I am an introvert. I generally prefer single-player games, often RPGs like Skyrim, where I can just get immersed in the game and play by myself. I like CS:GO, and it's pretty much the only game I play online.
Hell, I do play Elder Scrolls Online as if it were Skyrim, ignoring that it is an MMORPG, I play it like I would play Skyrim. Only a couple times I partied with someone when playing, and it was a friend of mine who got the game at the same time as me, and we went and played a few dungeons with other friends of his.
Just those 2 or 3 times though, other than that, I always solo MMORPGs.
My favourite games ARE single-player.
I barely ever played Pokémon online, too, though I played thousands of hours of it overall, counting every game.
Gravity Rush, Persona 3, Pokémon, Skyrim, Tetris, etc. That's the kind of game I play.